Extend the problem from the last chapter to repeat the operation until the word
end
is entered for one of the values. (Hint: use an infinite loop, and then do a
last
if either value is
end
.)

Rewrite the exercise from
Chapter 4,
Control Structures
, summing numbers up to 999, using a loop that exits from the middle. (Hint: use a naked block with a
redo
at the end to get an infinite loop, and a
last
in the middle based on a condition.)